期刊
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
卷 43, 期 4, 页码 736-742出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2005.843953
关键词
Advanced Land Imager (ALI); Earth Observing 1 (EO-1); flow stripes; ice flow; ice shelves; photoclinometry; streaklines
We investigate the usefulness of the experimental Advanced Land Imager instrument onboard the Earth Observing I satellite and a shape-from-shading technique to study streak-lines (flow stripes) on the Amery Ice Shelf, Antarctica. Local variations in brightness in the image are directly related to surface topography because the snow surface reflectivity is mostly uniform. Image brightness values are combined with sun position and streakline orientation to calculate surface topography to centimeter-level vertical precision. The amplitude of the streaklines is typically 1-2 m, and spacing is on the order of 1 km. The streaklines; show complex along-flow changes in cross-sectional shape that we interpret to be effects from temporal changes in grounding line dynamics and decay of ice topography due to flow. Cross-sectional areas of the streaklines are calculated at various points along flow to investigate morphological evolution. The study area subscene covers a 28 km x 90 km area and covers similar to 350 years of ice flow.
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